Md. Code, State Government § 10–117

(a) (1) Except as otherwise provided in subsection (b) of this section or in other law, the effective date of a regulation is:

(i) the 10th calendar day after notice of adoption is published in the Register; or

(ii) a later date that the notice sets.

(2) For calculation of the effective date under this subsection:

(i) § 1–302 of the General Provisions Article does not apply;

(ii) the issue date of the Register in which the notice is published is not counted; and

(iii) each other calendar day, including Saturdays, Sundays, and legal holidays, is counted.

(b) The effective date of a regulation after its emergency adoption is the date that the Committee sets.